(Reuters) – British boxer Amir Khan suggested that he is considering retirement from the sport after suffering a comprehensive defeat with a sixth-round TKO at the hands of Kell Brook on Saturday. The 35-year-old Khan was outclassed by compatriot Brook from start to finish, and looked to be in dire straits before the referee stepped in to save him from any more punishment. Khan, who won silver as a lightweight at the Athens Olympics in 2004 and is a former unified light-welterweight champion, said he was hoping to spend more time with his family. “It’s something to think about, definitely,” Kh…